What event led to the Dunkirk evacuation in 1940?

• A. The Allied invasion of France
• B. The Japanese attack on Pearl Harbor
• C. The German breakthrough through Belgium and northern France trapped Allied troops at Dunkirk
• D. The German surrender in the West

Answer: (D)

The key idea is that the Dunkirk evacuation happened because German forces broke through Belgium into northern France, creating a large encirclement that trapped Allied troops around Dunkirk. When the German advance split the Allied lines and pushed them toward the coast, there was no time to regroup or retreat by normal means. The situation forced a desperate evacuation, known as Operation Dynamo, to rescue as many soldiers as possible from the pocket between late May and early June 1940. The other events listed aren’t what triggered this evacuation: Pearl Harbor happened later and in a different theater, the Allied invasion of France occurred in 1944, and the German West surrender did not cause the evacuation. So the event that actually led to Dunkirk was the German breakthrough through Belgium and northern France that trapped the Allied forces at the port.